Spring项目启动报错No qualifying bean of type [xxx] available: expected single matching bean but found 2

启动报错：

No qualifying bean of type [class1] available: expected single
matching bean but found 2,class1,classImp1

这个问题的根源在于，class1和classImp1都被加入Bean容器管理，但是@AutoWired进行自动注入，没有指定具体class1的ID，那么spring通过反射机制使用byName自动注入策略，将配置文件的value注入，而不是Id值，这就导致找到两个相同的value值，无法选择注入哪一个，导致报错。

通过查找资料，发现可以在@Autowired下面再加上@Qualifier(“类名”)注释，来指定注入具体的注入类。

但是又报出如下错误

No qualifying bean of type [class1] available: expected at least 1 bean which qualifies as autowire candidate

刚开始感觉莫名其妙，后来发现在applicationContext.xml中对于classImpl1的bean已经新增了classImpl1，并且id设置的并不是classImpl1的类名。

所以设置@Qualifier(“bean中classImpl1的id值”)

最终代码

在applicationContext.xml文件中

 < bean id="class123Dao" class="xxx.xxx.ClassDaoImpl">

在classServiceImpl（调用ClassDaoImpl类的Service中）

@Autowired
@Qualifier("class123Dao")
ClassDao classDao;  //ClassDao是ClassDaoImpl的接口

问题解决。

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